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Diff for /gforth/kernel/xchars.fs between versions 1.3 and 1.9

version 1.3, 2005/01/12 21:21:53 version 1.9, 2007/10/03 16:58:15
Line 1 Line 1
 \ extended characters (either 8bit or UTF-8, possibly other encodings)  \ extended characters (either 8bit or UTF-8, possibly other encodings)
 \ and their fixed-size variant  \ and their fixed-size variant
   
 \ Copyright (C) 2005 Free Software Foundation, Inc.  \ Copyright (C) 2005,2006 Free Software Foundation, Inc.
   
 \ This file is part of Gforth.  \ This file is part of Gforth.
   
Line 23 Line 23
 \ utf-8 words with an appropriate setting of max-single-byte, but I  \ utf-8 words with an appropriate setting of max-single-byte, but I
 \ like to see how an 8bit setting without UTF-8 stuff looks like.  \ like to see how an 8bit setting without UTF-8 stuff looks like.
   
 DEFER XEMIT ( xc -- )  Defer xemit ( xc -- ) \ xchar-ext
 DEFER XKEY ( -- xc )  \G Prints an xchar on the terminal.
 DEFER XCHAR+ ( xc-addr1 -- xc-addr2 )  Defer xkey ( -- xc ) \ xchar-ext
 DEFER XCHAR- ( xc-addr1 -- xc-addr2 )  \G Reads an xchar from the terminal. This will discard all input
 DEFER +X/STRING ( xc-addr1 u1 -- xc-addr2 u2 )  \G events up to the completion of the xchar.
 DEFER -X/STRING ( xc-addr1 u1 -- xc-addr2 u2 )  Defer xchar+ ( xc-addr1 -- xc-addr2 ) \ xchar-ext
 DEFER XC@ ( xc-addr -- xc )  \G Adds the size of the xchar stored at @var{xc-addr1} to this address,
 DEFER XC!+? ( xc xc-addr1 u1 -- xc-addr2 u2 f ) \ f if operation succeeded  \G giving @var{xc-addr2}.
 DEFER XC@+ ( xc-addr1 -- xc-addr2 xc )  Defer xchar- ( xc-addr1 -- xc-addr2 ) \ xchar-ext
 DEFER XC-SIZE ( xc -- u ) \ size in cs  \G Goes backward from @var{xc_addr1} until it finds an xchar so that
 DEFER -TRAILING-GARBAGE ( addr u1 -- addr u2 ) \ remove trailing incomplete xc  \G the size of this xchar added to @var{xc_addr2} gives
   \G @var{xc_addr1}.
   Defer +x/string ( xc-addr1 u1 -- xc-addr2 u2 ) \ xchar  plus-x-slash-string
   \G Step forward by one xchar in the buffer defined by address
   \G @var{xc-addr1}, size @var{u1} pchars. @var{xc-addr2} is the address
   \G and u2 the size in pchars of the remaining buffer after stepping
   \G over the first xchar in the buffer.
   Defer x\string- ( xc-addr1 u1 -- xc-addr1 u2 ) \ xchar  x-back-string-minus
   \G Step backward by one xchar in the buffer defined by address
   \G @var{xc-addr1} and size @var{u1} in pchars, starting at the end of
   \G the buffer. @var{xc-addr1} is the address and @var{u2} the size in
   \G pchars of the remaining buffer after stepping backward over the
   \G last xchar in the buffer.
   Defer xc@ ( xc-addr -- xc ) \ xchar-ext xc-fetch
   \G Fetchs the xchar @var{xc} at @var{xc-addr1}.
   Defer xc!+? ( xc xc-addr1 u1 -- xc-addr2 u2 f ) \ xchar-ext     xc-store-plus-query
   \G Stores the xchar @var{xc} into the buffer starting at address
   \G @var{xc-addr1}, @var{u1} pchars large. @var{xc-addr2} points to the
   \G first memory location after @var{xc}, @var{u2} is the remaining
   \G size of the buffer. If the xchar @var{xc} did fit into the buffer,
   \G @var{f} is true, otherwise @var{f} is false, and @var{xc-addr2}
   \G @var{u2} equal @var{xc-addr1} @var{u1}. XC!+?  is safe for buffer
   \G overflows, and therefore preferred over XC!+.
   Defer xc@+ ( xc-addr1 -- xc-addr2 xc ) \ xchar-ext      xc-fetch-plus
   \G Fetchs the xchar @var{xc} at @var{xc-addr1}. @var{xc-addr2} points
   \G to the first memory location after @var{xc}.
   Defer xc-size ( xc -- u ) \ xchar-ext
   \G Computes the memory size of the xchar @var{xc} in pchars.
   Defer x-size ( xc-addr u1 -- u2 ) \ xchar
   \G Computes the memory size of the first xchar stored at @var{xc-addr}
   \G in pchars.
   Defer x-width ( xc-addr u -- n ) \ xchar-ext
   \G @var{n} is the number of monospace ASCII pchars that take the same
   \G space to display as the the xchar string starting at @var{xc-addr},
   \G using @var{u} pchars; assuming a monospaced display font,
   \G i.e. pchar width is always an integer multiple of the width of an
   \G ASCII pchar.
   Defer -trailing-garbage ( xc-addr u1 -- addr u2 ) \ xchar-ext
   \G Examine the last XCHAR in the buffer @var{xc-addr} @var{u1}---if
   \G the encoding is correct and it repesents a full pchar, @var{u2}
   \G equals @var{u1}, otherwise, @var{u2} represents the string without
   \G the last (garbled) xchar.
   
 \ derived words, faster implementations are probably possible  \ derived words, faster implementations are probably possible
   
 : X@+/string ( xc-addr1 u1 -- xc-addr2 u2 xc )  : x@+/string ( xc-addr1 u1 -- xc-addr2 u2 xc )
     \ !! check for errors?      \ !! check for errors?
     over >r +x/string      over >r +x/string
     r> xc@ ;      r> xc@ ;
Line 47  DEFER -TRAILING-GARBAGE ( addr u1 -- add Line 88  DEFER -TRAILING-GARBAGE ( addr u1 -- add
 : char- ( c-addr1 -- c-addr2 )  : char- ( c-addr1 -- c-addr2 )
     [ 1 chars ] literal - ;      [ 1 chars ] literal - ;
   
 : 1/string ( c-addr1 u1 -- c-addr2 u2 )  : +string ( c-addr1 u1 -- c-addr2 u2 )
     1 /string ;      1 /string ;
   : string- ( c-addr1 u1 -- c-addr1 u2 )
 : -1/string ( c-addr1 u1 -- c-addr2 u2 )      1- ;
     -1 /string ;  
   
 : c!+? ( c c-addr1 u1 -- c-addr2 u2 f )  : c!+? ( c c-addr1 u1 -- c-addr2 u2 f )
     dup 1 chars u< if \ or use < ?      dup 1 chars u< if \ or use < ?
Line 69  DEFER -TRAILING-GARBAGE ( addr u1 -- add Line 109  DEFER -TRAILING-GARBAGE ( addr u1 -- add
     ['] key is xkey      ['] key is xkey
     ['] char+ is xchar+      ['] char+ is xchar+
     ['] char- is xchar-      ['] char- is xchar-
     ['] 1/string is +x/string      ['] +string is +x/string
     ['] -1/string is -x/string      ['] string- is x\string-
     ['] c@ is xc@      ['] c@ is xc@
     ['] c!+? is xc!+?      ['] c!+? is xc!+?
     ['] count is xc@+      ['] count is xc@+
     ['] c-size is xc-size      ['] c-size is xc-size
       ['] c-size is x-size
       ['] nip IS x-width
     ['] noop is -trailing-garbage      ['] noop is -trailing-garbage
 ;  ;
Removed from v.1.3  
changed lines
  Added in v.1.9

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